The arachnoid villi absorb excess cerebrospinal fluid, or CSF, that collects in the venous sinuses surrounding the brain. Acting as one-way valves, the arachnoid villi, or arachnoid granulations, help to ensure that the ... More » Science Human Anatomy Nerves

Intestinal villi are small, finger-like projections that protrude from the walls of the small intestine. The villi increase the absorptive surface of the intestine and ensure efficient absorption of nutrients. The villi ... More » Science Human Anatomy Organs

Villi are microscopic, slender, hair-like projections that line the small intestine to facilitate food absorption, explains Encyclopædia Britannica. Villi number between 6,000 and 25,000 per square inch of the small inte... More » Science Human Anatomy Organs
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The cerebral aqueduct, or "aqueduct of Sylvius," connects the third and fourth ventricles providing a conduit for cerebrospinal fluid (CSF) to flow inside the brain. This aqueduct is located in the midbrain and forms par... More » Science Human Anatomy Nerves

The function of the foramen magnum is to allow nerves, blood vessels and fluid to pass in and out of the brain. The foramen magnum is a large hole at the base of the skull. More » Science Human Anatomy Nerves

The pia mater, the innermost membrane covering the central nervous system, protects delicate nerve tissue, supplies blood to the brain, and produces and circulates spinal fluid. It also connects different parts of the ce... More » Science Human Anatomy Nerves

Cerebrospinal fluid is a clear, colorless fluid found in the subarachnoid spaces in the cranial cavity, where it functions as a shock absorber for the delicate tissues of the brain, according to Fluids and Barriers of th... More » Science Human Anatomy Nerves